# Thread: factoring and algebra question

1. ## factoring and algebra question

9. x3 + x2 - x – 1

10. Suppose a football iskicked from the ground and its height, h, in feet above the ground is given byh = -3.9t2 + 15.6t.
The time, t, represents thenumber of seconds after the ball is kicked. At what time does the football hitthe ground?

2. ## Re: factoring and algebra question

Originally Posted by nikkiann
[FONT="]9. x3 + x2 - x – 1[/FONT]
[FONT="] [/FONT]
[FONT="]10. Suppose a football iskicked from the ground and its height, h, in feet above the ground is given byh = -3.9t2 + 15.6t.[/FONT]
The time, t, represents thenumber of seconds after the ball is kicked. At what time does the football hitthe ground?
What is the height of the ball when it hits the ground? It would be h = 0 m, right?

-Dan

3. ## Re: factoring and algebra question

$x^3+x^2-x-1 = x^2(x+1) - (x+1) = \, ?$

4. ## Re: factoring and algebra question

Originally Posted by Cervesa
$x^3+x^2-x-1 = x^2(x+1) - (x+1) = \, ?$
Damn, why did I never thought of that?